This in vitro study evaluated the flexural strength, impact hardness, and surface roughness of 3D-printed denture base resin subjected to thermal cycling treatment.According ISO 20795-1:2013 standards, 120 acrylic specimens (40/flexural strength test, 40/impact 40/surface hardness n = 10) were fabricated distributed into two groups: heat-polymerized; (Major.Base.20) as control (NextDent) experimental group. Half each group 10,000 cycles 5 55°C simulating 1 year clinical use. Flexural (MPa),...

Bulk-fill composites have been introduced to facilitate the placement of deep direct resin composite restorations. This study aimed at analyzing cervical marginal integrity bulk-fill vs incremental and open-sandwich class II restorations after thermomechanical cycling using replica scanning electron microscopy (SEM) ranking according World Dental Federation (FDI) criteria. Box-only cavities were prepared in 91 maxillary premolars with gingival margin placed 1 mm above below cemento-enamel...

To assess the effect of addition different concentrations nanodiamonds (NDs) on flexural strength, impact and surface roughness heat-polymerized acrylic resin.120 specimens were fabricated from resin. They divided into a control group pure polymethylmethacrylate (PMMA; Major.Base.20) three tested groups (PMMA-ND) with 0.5%wt, 1%wt, 1.5%wt added ND to PMMA. Flexural strength was determined using three-point bending test. Impact recorded by Charpy type Surface test performed Contour GT...

This study is aimed at evaluating the hybrid reinforcement effects of zirconium oxide nanoparticles (nano-ZrO2) and glass fibers (GFs) different ratios on flexural impact strengths a polymethylmethacrylate (PMMA) denture base. A total 160 specimens were fabricated from heat-polymerized acrylic resins using water bath technique. For control group, did not receive any additions; for test concentrations nano-ZrO2/GFs 5% PMMA polymer added. The as follows: 5%-0%, 4%-1%, 3%-2%, 2.5%-2.5%, 2%-3%,...

To compare flexural strength, elastic modulus, and surface hardness of computer aided design manufacturing CAD-CAM milled, 3D-printed, heat-polymerized denture base resins.A total 120 specimens were fabricated from acrylic resin (HP), milled (Avadent IvoCad), 3D-printed (ASIGA, FormLabs, NextDent). The divided into 6 groups according to the type material (n = 20/material) (10/flexural properties 10/hardness). Flexural strength modulus evaluated by 3-point bending test Vickers test....

Abstract Purpose To evaluate the flexural strength (FS), impact (IS), surface roughness (Ra), and hardness of 3D‐printed resin incorporating silicon dioxide nanoparticles (SNPs). Materials Methods A total 320 acrylic specimens were fabricated with different dimensions according to test specifications divided into a control group heat denture base resin, 3 groups (80/test (n = 10) unmodified, 0.25 wt%, 0.5 wt% SNPs modified resin. 10,000 thermal cycles performed half specimens. FS, IS (Charpy...

Abstract Purpose To evaluate and compare the surface properties (roughness hardness) of poly(methylmethacrylate) denture base material modified with zirconium dioxide (ZNPs), silicon (SNPs), diamond (DNPs) nanoparticles. Materials methods Two hundred sixty heat‐polymerized acrylic resin disks (15 × 2 mm) were prepared. ZNPs, SNPs, DNPs added in concentrations 0%, 0.5%, 1.0%, 2.5%, 5.0% by weight powder. This yielded a total 13 groups for each test according to filler type concentration (n =...

This study was conducted to assess the level of participation dental undergraduate students in extracurricular activities (ECAs) and factors affecting this participation.The included enrolled programs at Faculty Dentistry, Alexandria University, Egypt, College University Dammam, Saudi Arabia. A questionnaire developed collect background information about students, their ECAs, time allocated for these activities. Students were asked perceptions relationship between ECAs academic studies,...

The aim of this work was to develop a new biological process for the fabrication silver nanoparticles (Ag-NPs) using extract xerophytic plant (Neurada procumbens) as reducing agent. fabricated Ag-NPs can effectively control multi-drug resistant gram-negative rods (MDR-GNRs), which were isolated from Buraidah Central Hospital (BCH), Saudi Arabia. predominant MDR-GNR bacteria included Klebsiella pneumoniae, Acinetobacter baumannii, and Escherichia coli. examined by diverse spectral analytical...

Candida albicans is the main causative pathogen of denture stomatitis, which affects many complete patients.To evaluate effect different concentrations nanodiamonds (NDs) added to polymethyl methacrylate (PMMA) base material on adhesion as well surface roughness and contact angle.Acrylic resin specimens sized 10×10×3 mm3 were prepared divided into four groups (n=30) according ND concentration (0%, 0.5%, 1%, 1.5% by wt). Surface was measured with a profilometer, angle goniometer. The NDs...

Cervical interfacial bonding quality has been a matter of deep concern. The purpose this study was to analyze microtensile bond strength (MTBS) and cervical gap distance (IGD) bulk-fill vs incremental-fill Class II composite restorations. Box-only cavities were prepared in 91 maxillary premolars (n = 7) with gingival margin placement 1 mm above the cementoenamel junction at one side below it on other side. Eighty-four divided into self-etch total-etch groups further subdivided six...

This study investigated the color stability and microhardness of five composites exposed to four beverages with different pH values. Composite discs were produced (n=10); Filtek Z250 (3M ESPE) P90 applied in two layers (2 mm, 20 seconds), Tetric N-Ceram Bulk Fill (TetricBF, Ivoclar Vivadent) SonicFill (Kerr) bulk (4 mm) then light cured (40 seconds, Ortholux-LED, 1600 mW/cm2). Indirect composite Sinfony was (Visio system, 3M ESPE). The specimens polished tested for stability; ΔE calculated...

To evaluate and compare the effects of glass fiber (GF), Zirconium oxide nanoparticles (nano-ZrO2 ), silicon dioxide (nano-SiO2 ) addition on flexural strength impact repaired denture base material.Heat-polymerized acrylic resin specimens were fabricated. All sectioned centrally beveled creating 2.5 mm repair gap except for 10 controls. Specimen grouping (n = 10/group) was done according to filler concentration 0%, 0.25%, 0.5%, 0.75% auto-polymerized powder. Modified mixed, packed in gap,...

This study assessed the impact of surface treatments and repair resin reinforcement with zirconium oxide nano-particles (nano-ZrO2) on flexural strength (FS) repaired denture base. A total 320 heat-polymerized acrylic specimens were prepared sectioned creating 2-mm gap. According to treatment, distributed into four groups: I) methyl methacrylate (M); II) alumina-blasted (AB); III) AB+silane coupling agent (SC); IV) AB+methacrylate based composite bonding (MA). Groups subdivided 4 (n=20)...

To compare the accuracy of intraoral and extraoral scanners (IOSs EOSs) with different scanning technologies.A phantom cast was used to simulate patient's mouth. Polyether impression made poured fabricate stone casts. The casts were scanned by two IOSs (3shape Trios 3, 3S Dental Wings, DW) EOSs (S600 Arti Zirkonzahn, ZK Ceramill map 600 Amann Girrbach, AG) obtain digital Reference teeth (canines, premolar, molars) dimensions measured on Geomagic software compared measurements done...

To compare the accuracy of 3D printed and digital casts produced from various intraoral extraoral scanners with different scanning technologies.A conventional stone cast was fabricated reference typodont scanned two (TRIOS 3 version 1.4.7.5, Dental Wings 2.1.0.421), (S600 Arti, Zirkonzahn, Ceramill map 600, Amann Girrbach GmbH). All scans were saved in form STL files measurements calculated using Geomagic analysis software. Two types assessed on casts: tooth- arch-level measurements....

This study aimed to evaluate the influence of different salivary pH on flexural strength, hardness, and surface roughness computer-aided design manufacturing (CAD/CAM) milled three-dimensional (3D)-printed denture base resins. One heat-polymerized, two CAD/CAM (IvoCad, AvaDent), 3D-printed (FormLabs, NextDent) resins were fabricated divided into five groups (n = 10) according solutions: three immersed in (5.7, 7.0, or 8.3), one group was distilled water (DW) as a positive control, had no...

Abstract Background Fracture of restored endodontically treated teeth is a common complication. The mechanical properties post systems may play role in the incidence tooth fracture. Aim purpose this study was to evaluate vitro fracture resistance and pattern with three different systems. Material methods Posts used were fiber‐reinforced composite resin posts ( FRC post), custom cast silver‐palladium, nickel‐chromium cores. A 3‐point bending test performed calculate flexural strengths elastic...